Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6f020d74fce867…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 19:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc8edb5d073c003e75479e5283218d02 SHA-1: 14d2d5b7fc321108f7900e559b9ba62c6708c590 SHA-256: 3b6f020d74fce8675294156d95f683a1606c4c5ca9dc44d839fb22843235e48d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Flash games 2020 online', which is likely a pretext to direct users to malicious URLs. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/wix?keyword=flash+games+2020+online
    • http://hardcreditcheck.info/lekeramelawizuwefefukdfqq.pdf
    • https://cdn.sqhk.co/votojuxosaf/Vjehfb1/crushing_ruin_farm_2020.pdf
    • http://pressit.fun/how_many_btus_does_a_22kw_generac_generator_useo22hf.pdf
    • http://microbestdigitalmeter.xyz/gelurisagutimuwomb06g.pdf
    • http://xelasurugopu.mywebcommunity.org/44679516144.pdf
    • http://tomogorman.com/why_do_we_need_to_study_technical_writingp0r7i.pdf
    • https://cdn.sqhk.co/jeforije/hhJSGgn/90726617710.pdf
    • http://importants.space/chromecast_built-_in_apk_mirrorfkb4x.pdf
    • http://afracheat9.xyz/malayalam_song_ambalamillathe_aaltharayil_vaazhum0y7nm.pdf
    • http://proflist-kursk.ru/1590251886495qjx.pdf
    • http://creditscorerepair.info/honda_rebel_250_specsfl5yd.pdf
    • http://glasshookahcatering.com/46549294381kyegx.pdf
    • http://sexedate69.site/how_many_lakes_and_rivers_are_there_in_canada4j6lm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fukezavazuj/diary_of_wimpy_kid_long_haul.pdf
    • https://uploads.strikinglycdn.com/files/e5cef3de-e419-4507-9408-be1440b13d69/nuvovezanowapege.pdf
    • https://s3.amazonaws.com/gazijewevan/home_renovation_budget_spreadsheet_uk.pdf
    • http://xumuritikoxuk.myartsonline.com/automobile_definition.pdf
    • https://s3.amazonaws.com/jexijer/amazing_grace_free_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/e55c04e1-a0b2-482f-bc4d-31810aa081fb/derasedotisorizakerinok.pdf
    • http://lukafimagog.atwebpages.com/53228715495.pdf
    • https://s3.amazonaws.com/jivuxo/django_format_date_in_template.pdf
    • http://firiwigisu.atwebpages.com/lupulonagifufogok.pdf
    • https://uploads.strikinglycdn.com/files/bb214b22-f201-4c4c-b2e5-e962a54413ed/17460409161.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cd.bin
66d9ed7a535906158ee5b7f26342e97bcc5b325016c71c2b771a25da980eb854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 5232 bytes
font_01_sfnt_off0001087c.bin
43e2938c4f185cd076b674e5a29a25b8236b98151a7e2125ae30ee3b95d2b805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 10864 bytes

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